FOR THOSE PAYING attention, this has been a fairly terrifying winter and spring. And I don’t just mean the presidential election. I mean that the signals we’re getting from the natural world indicate we’re crossing thresholds much more quickly than expected.
February, for instance, was the most anomalously hot month ever recorded on the planet, crushing all records. The world had pledged in Paris in December to try to hold global temperature increases to 1.5 degrees Celsius—well, February was just about at that level already.
The elevated temperatures were especially noticeable in the Arctic—for long stretches of the winter the region as a whole was as much as 18 degrees Fahrenheit above average. (Christmas Eve was almost 50 degrees warmer than normal at the North Pole). Not surprisingly, this meant the lowest levels of Arctic sea ice ever recorded by late March.
Meanwhile in the Antarctic, new data showed that sea level may be set to rise far faster than expected, as the great ice sheets start to slide into the ocean—the water could go up by meters in the course of this century, which would make the defense of most of the world’s great cities a nightmare.
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